---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 02/13/17: 13 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:05 AM - Re: Icom antenna junction box (GLEN MATEJCEK) 2. 05:51 AM - Re: Re: Icom antenna junction box (Robert L. Nuckolls, III) 3. 08:06 AM - = = = PIDG SPLICES ARE SOLD OUT = = (Robert L. Nuckolls, III) 4. 08:49 AM - Re: Z-17/ alternator wire protection (blues750) 5. 09:02 AM - Re: Z-17/ alternator wire protection (user9253) 6. 09:05 AM - Re: Z-17/ alternator wire protection (blues750) 7. 11:42 AM - "slow blow" ? (Ken Ryan) 8. 12:44 PM - Re: "slow blow" ? (Robert McCallum) 9. 06:34 PM - Re: "slow blow" ? (Robert L. Nuckolls, III) 10. 06:35 PM - Red/Blue PIDG tool (Robert L. Nuckolls, III) 11. 07:13 PM - Re: "slow blow" ? (Ken Ryan) 12. 07:17 PM - Re: Red/Blue PIDG tool (johnbright) 13. 08:42 PM - Z12-Question (don van santen) ________________________________ Message 1 _____________________________________ Time: 04:05:52 AM PST US From: GLEN MATEJCEK Subject: AeroElectric-List: Re: Icom antenna junction box Lo those many days ago that I tinkered with radios a little, keying the mic without a load connected would likely fry the transmitter. Is it possible that a crappy connection internal to the splitter box could be damaging the current crop of radios over time? ________________________________ Message 2 _____________________________________ Time: 05:51:34 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Icom antenna junction box At 06:02 AM 2/13/2017, you wrote: >Lo those many days ago that I tinkered with >radios a little, keying the mic without a load >connected would likely fry the transmitter.=C2 Is >it possible that a crappy connection internal to >the splitter box could be damaging the current crop of radios over time? An excellent notion to ponder . . . the root concern about the Icom Antenna j-box is the quality of the normally-closed switch contacts that automatically disconnect the panel mount radio from the feedline when the hand-held coax is plugged in. A secondary concern is loss of feedline integrity with the inclusion of simple, single strands of wire used to make up connections within the box. Without putting one on the test bench I don't KNOW the degree of upset but we know that it's not zero. The very first all solid state transceiver I brushed elbows with was installed in the T-41 trainers we built for the USAF back in the 1967 time frame. These were C-172s with engines out of the C-337 (0-360, 210 hp). Always flown as a two-place a/c (but with a compliment of heavier military avionics) this made for a VERY snappy C-172. Intended for use at the USAF Academy in Colorado, the extra horsepower was very welcomed for student training in the rarified air of the high plains. Part of the standard equipment was a little solid state, panel mount style transceiver mounted back in the tail and crystals installed only for 121.5 Mhz only. I'd never heard of the brand before and now don't recall it . . . but I do recall that several radios were toasted during production test and trouble shooting phases due to transmission into open feedlines. This was long before the manufacturers figured out how to built an SWR detection system into the radio to effect automatic shutdown of the transmitter when SWR was too high. Further, the early VHF power transistors were rather intolerant of hi SWR to begin with. Modern radios are probably the much more robust, MOS-FET output stages and will include auto-shutdown for high SWR. However, a dodgy switch in the Icom antenna j-box could very ell contribute to noisy rformance of the radio. Bob . . . ________________________________ Message 3 _____________________________________ Time: 08:06:01 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: = = = PIDG SPLICES ARE SOLD OUT = = The splices on hand are all spoken for. There's a young man who drops by my house most days after school to help around the shop. We'll set him to stuffing and addressing envelopes this afternoon! Thanks guys. Bob . . . ________________________________ Message 4 _____________________________________ Time: 08:49:37 AM PST US Subject: AeroElectric-List: Re: Z-17/ alternator wire protection From: "blues750" No, it's because the alternator output is a loop that goes to zero current when opened anywhere in that loop . . . one fuse suffices for both leads. Would I be assuming correctly this is also true for a three phase PMA? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=466129#466129 ________________________________ Message 5 _____________________________________ Time: 09:02:12 AM PST US Subject: AeroElectric-List: Re: Z-17/ alternator wire protection From: "user9253" No, to stop three phase current, at least two of the three phases must be opened. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=466131#466131 ________________________________ Message 6 _____________________________________ Time: 09:05:42 AM PST US Subject: AeroElectric-List: Re: Z-17/ alternator wire protection From: "blues750" Agree...found my notes on this topic along with a drawing by Bob on how to disconnect 3 phase PMA. [Rolling Eyes] Read this topic online here: http://forums.matronics.com/viewtopic.php?p=466132#466132 ________________________________ Message 7 _____________________________________ Time: 11:42:59 AM PST US From: Ken Ryan Subject: AeroElectric-List: "slow blow" ? The following statements appear in the (sometimes poorly translated) Rotax 914 installation manual: "the rectifier-regulator has to be protected by a slow blowing 25A fuse..." "Each of the two fuel pumps has to be protected by y slow blowing 5A fuse in accordance with wiring diagram..." "The TCU (turbo control unit) has to be protected by a slow blowing 2A fuse in accordance with the wiring diagram..." Do you guys think they actually mean to call for slow blow fuses (as opposed to "regular" auto fuses)? Aren't fuses already "slow blow" when compared to breakers? Or did I get that backwards? Ken "the rectifier-regulator has to be protected by a slow blowing 50A fuse or a circuit breaker" ________________________________ Message 8 _____________________________________ Time: 12:44:30 PM PST US From: Robert McCallum Subject: Re: AeroElectric-List: "slow blow" ? Ken; Fuses are generally "faster" than breakers. "Slow blow" fuses will hold greater overloads for longer before melting, thus the term "slow to blow". They will still usually be faster than an equivalent breaker. The greater the overload magnitude the faster the protective device opens in most all situations whether it be a fuse or a breaker. Bob McC ---------- Original Message ---------- From: Ken Ryan The following statements appear in the (sometimes poorly translated) Rotax 914 installation manual: "the rectifier-regulator has to be protected by a slow blowing 25A fuse..." "Each of the two fuel pumps has to be protected by y slow blowing 5A fuse in accordance with wiring diagram..." "The TCU (turbo control unit) has to be protected by a slow blowing 2A fuse in accordance with the wiring diagram..." Do you guys think they actually mean to call for slow blow fuses (as opposed to "regular" auto fuses)? Aren't fuses already "slow blow" when compared to breakers? Or did I get that backwards? Ken "the rectifier-regulator has to be protected by a slow blowing 50A fuse or a circuit breaker" ________________________________ Message 9 _____________________________________ Time: 06:34:50 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: "slow blow" ? At 01:37 PM 2/13/2017, you wrote: >The following statements appear in the (sometimes poorly translated) >Rotax 914 installation manual: > >"the rectifier-regulator has to be protected by a slow blowing 25A fuse..." Use MAX30 + inline holder >"Each of the two fuel pumps has to be protected by y slow blowing 5A >fuse in accordance with wiring diagram..." An ATC5 in fuseblock is probably just fine. >"The TCU (turbo control unit) has to be protected by a slow blowing >2A fuse in accordance with the wiring diagram..." An ATC3 in the fuseblock is recommended. >Do you guys think they actually mean to call for slow blow fuses (as >opposed to "regular" auto fuses)? Aren't fuses already "slow blow" >when compared to breakers? Or did I get that backwards? Compared to breakers, ALL fuses are faster than greased lightning. Then too, 'slo-blo' fuses are a tiny fraction of the fuse market and not available in our favorite plastic package. If you get nuisance trips, upsize the 'fast' fuse to one step. Bob . . . ________________________________ Message 10 ____________________________________ Time: 06:35:12 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Red/Blue PIDG tool Just ran across an offering of the venerable AMP 59250 PIDG crimper on ebay http://tinyurl.com/grw4bdg I've still got the first one I ever owned. Bought it while I worked at Cessna the first time. I've purchased two more since. The price of this offer on eBay is VERY reasonable for this tool. Bob . . . ________________________________ Message 11 ____________________________________ Time: 07:13:15 PM PST US From: Ken Ryan Subject: Re: AeroElectric-List: "slow blow" ? Thanks Bob! On Mon, Feb 13, 2017 at 4:56 PM, Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > At 01:37 PM 2/13/2017, you wrote: > > The following statements appear in the (sometimes poorly translated) Rotax > 914 installation manual: > > "the rectifier-regulator has to be protected by a slow blowing 25A fuse..." > > > Use MAX30 + inline holder > > "Each of the two fuel pumps has to be protected by y slow blowing 5A fuse > in accordance with wiring diagram..." > > > An ATC5 in fuseblock is probably just fine. > > > "The TCU (turbo control unit) has to be protected by a slow blowing 2A > fuse in accordance with the wiring diagram..." > > > An ATC3 in the fuseblock is recommended. > > > Do you guys think they actually mean to call for slow blow fuses (as > opposed to "regular" auto fuses)? Aren't fuses already "slow blow" when > compared to breakers? Or did I get that backwards? > > > Compared to breakers, ALL fuses are faster than greased > lightning. Then too, 'slo-blo' fuses are a tiny fraction > of the fuse market and not available in our favorite > plastic package. > > If you get nuisance trips, upsize the 'fast' fuse to > one step. > > > Bob . . . > ________________________________ Message 12 ____________________________________ Time: 07:17:06 PM PST US Subject: AeroElectric-List: Re: Red/Blue PIDG tool From: "johnbright" Does it do a better job for typical home builder versus RCT-1? -------- John Bright, RV-6A, at Finish Kit Continental Titan IOX-360, 8.5:1, vertical sump, SDSEFI EM-5, injectors in heads. Aeroelectric Z-12. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=466157#466157 ________________________________ Message 13 ____________________________________ Time: 08:42:49 PM PST US From: don van santen Subject: AeroElectric-List: Z12-Question Bob, No arguments with the Z13/8 being the most robust system for the dollars spent. The only thing I do not like about it is having to give up perfectly good devices due to an insufficient source of electrons to drive them. Z12 has the power, but not the "layers". Is it possible/easy to have a parallel battery contactor and switch to actuate it? If not than how about a 2 rear replacement cycle for the contactor and switch? I already do the the annual replacement of the PC680 battery. Any thoughts on this? 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